Successful Fertilization and Seed Set from Pollination on Immature Non-dehisced Flowers of Eucalyptus globulus

Trindade, Helena; Boavida, Leonor C.; Borralho, N. M. G.; Feijó, José A.

doi:10.1006/anbo.2000.1359

Cited by 19 publications

(24 citation statements)

References 21 publications

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“…It has been proposed that the extracellular matrix of the styles assists pollen tube migration (Lord 2003) and provides nutritive support for the growing pollen tubes (de Graaf et al 2001). Consistent with the results of this study, Trindade et al (2001) also reported a dramatic reduction in the number of outcross pollen tubes reaching the base of E. globulus styles. The general pattern of high pollen tube attrition in the first 1 mm of the cut style was evident in all six of the genotypes examined.…”

Section: Discussionsupporting

confidence: 93%

The relationship of the female reproductive success of Eucalyptus globulus to the endogenous properties of the flower

et al. 2008

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Low capsule and seed set is a major factor limiting seed production in Eucalyptus globulus seed orchards. Controlled pollination studies showed that the reproductive success (number of seeds produced per flower pollinated) was primarily determined by the female. We aimed to identify the factors contributing to the differences in reproductive success between female genotypes in terms of the physical and anatomical properties of the flower. We studied pairs of genotypes of high and low reproductive success from each of three races (Furneaux Group, Strzelecki Ranges and Western Otways) growing in a seed orchard. Controlled pollinations were performed on six females and along with flower physical measurements, pollen tube growth and seed set were assessed. Overall tree reproductive success was positively correlated with flower size, ovule numbers, style size, cross-sectional area of conductive tissue within the style (all of which were inter-correlated) and the proportion of pollen tubes reaching the bottom of the style. Significant positive correlations of reproductive success and flower physical properties between different ramets of the same genotypes across seasons suggests a genetic basis to the variation observed. The majority of pollen tube attrition occurred within the first millimetre of the cut style and appeared to be associated with differences in style physiology. When examined as pairs within races the difference in reproductive success for the Western Otways pair was simply explained by differences in flower size and the number of ovules per flower. Physical features did not differ significantly for the Strzelecki Ranges pair, but the proportion of pollen tubes reaching the bottom of the style was lower in the less reproductively successful genotype, suggesting an endogenous physiological constraint to pollen tube growth. The difference in reproductive success between the females from the Furneaux Group was associated with a combination of these factors.

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Section: Discussionsupporting

confidence: 93%

The relationship of the female reproductive success of Eucalyptus globulus to the endogenous properties of the flower

et al. 2008

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“…But the percentage of successfully rescued ovules was very low indeed. This rather low proportion could perhaps be improved by the imposition of a variety of physical and/or chemical treatments, for example, bud pollination (Trindade et al 2001), in vitro pollination (Van Tuyl et al 1991) and phytohormone treatment (Dinu et al 2005).…”

Section: Discussionmentioning

confidence: 99%

Production and characterisation of the intergeneric hybrids between Dendranthema morifolium and Artemisia vulgaris exhibiting enhanced resistance to chrysanthemum aphid (Macrosiphoniella sanbourni)

Deng

Chen

et al. 2009

Planta

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Aphids represent the most destructive of chrysanthemum pests to cultivation. Reliable variety sources of resistance and control methods are limited, so development of highly resistant breeding lines is desirable. An intergeneric hybrid between Dendranthema morifolium (chrysanthemum) variety 'Zhongshanjingui' and Artemisia vulgaris (mugwort) 'Variegata' was attempted. Most of the hybrid embryos aborted at an early developmental stage. Embryo rescue allowed the generation of hybrid plants, whose hybridity was confirmed by a combination of morphological, cytological and GISH analysis. The hybrids were vigorous, flowered normally, and their flower and leaf shape resembled those of the chrysanthemum more than those of the mugwort parent. The hybrids showed much higher resistance to chrysanthemum aphid (Macrosiphoniella sanbourni) than maternal chrysanthemum by inoculation test. The leaves of the hybrid developed a higher density of trichomes and secretory glands compared to the maternal chrysanthemum. GC-MS analysis revealed that approximately 51% of the essential oil in the hybrid leaves were monoterpenoids and sesquiterpenoids, while the proportion in the chrysanthemum was approximately 37%, and in the mugwort was approximately 90%. It is inferred that higher aphid resistance in the hybrid mainly owed to the leaf micromorphology and bioactive essential oil content.

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“…Most eucalypts are protandrous, and the stigma is not receptive for up to 10 days after anthesis (Harbard et al 1999;Randall et al 2012). The one-stop pollination method reduces the risk of pollinating when the stigma is not receptive by removing the tip of the style and may also overcome incompatibility reactions that block pollen tube growth (Patterson et al 2004;Trindade et al 2001). This method also reduces the number of operator visits and therefore is less expensive than the three-stop method (Williams et al 1999).…”

Section: Introductionmentioning

confidence: 99%

Comparison of three pollination methods for Eucalyptus argophloia, a small-flowered eucalypt

Randall¹,

Walton²,

Lee³

et al. 2014

Annals of Forest Science

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Abstract& Context Most studies assess pollination success at capsule maturity, and studies of pre-zygotic processes are often lacking. & Aims This study investigates the suitability of controlled pollination for a potential forestry plantation species, Eucalyptus argophloia, by examining pre-and post-zygotic pollination success. & Methods Pollen tube development, capsule set and seed set are compared following three-stop pollination, artificially induced protogyny (AIP), AIP unpollinated and open pollination. The fecundity of stored pollen was compared with that of fresh pollen. & Results Three-stop pollination, AIP and open pollination had similar numbers of pollen tubes, but AIP unpollinated had none. Open pollination produced significantly more capsules and total number of seeds than the other treatments. There were significantly more seeds per retained capsule for the open pollination and three-stop pollination treatments than for the AIP and AIP unpollinated pollination treatments. There were no significant differences relative to the age of pollen. & Conclusions Pre-zygotic success in terms of pollen tubes was similar for open-pollinated, three stop and AIP, but was not reflected in post-zygotic success when the open pollination and three-stop method produced significantly more seeds per retained capsule than the AIP treatments and open pollination yielded more seeds. Capsule set and total seed set for open pollination, and fewer capsules in controlled pollinations, may reflect physical damage to buds because of the small E. argophloia flowers. Suitable alternative breeding strategies other than controlled pollinations are discussed for this species.

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Successful Fertilization and Seed Set from Pollination on Immature Non-dehisced Flowers of Eucalyptus globulus

Cited by 19 publications

References 21 publications

The relationship of the female reproductive success of Eucalyptus globulus to the endogenous properties of the flower

The relationship of the female reproductive success of Eucalyptus globulus to the endogenous properties of the flower

Production and characterisation of the intergeneric hybrids between Dendranthema morifolium and Artemisia vulgaris exhibiting enhanced resistance to chrysanthemum aphid (Macrosiphoniella sanbourni)

Comparison of three pollination methods for Eucalyptus argophloia, a small-flowered eucalypt

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